Background

Description

Modify and return the given map as follows: if exactly one of the keys "a" or "b" has a value in the map (but not both), set the other to have that same value in the map.

Format

Input

Output

Samples

"a": "aaa" "c": "cake"

{"a": "aaa", "b": "aaa", "c": "cake"}

"b": "bbb" "c": "cake"

{"a": "bbb", "b": "bbb", "c": "cake"}

"a": "aaa" "b": "bbb" "c": "cake"

{"a": "aaa", "b": "bbb", "c": "cake"}

Limitation

1s, 1024KiB for each test case.